Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 678 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) use daylight to read
2. 2.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
6. 6.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
7. 7.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) leave the TV on standby
20. 20.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
22. 22.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to use LED lamps saves electricity. (a) False (b) True
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.True or false: to use old filament bulbs saves electricity. (a) False (b) True
28. 28.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
30. 30.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) leave the TV on standby
35. 35.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
37. 37.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open

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